28364645 has 4 divisors (see below), whose sum is σ = 34037580. Its totient is φ = 22691712.

The previous prime is 28364629. The next prime is 28364647. The reversal of 28364645 is 54646382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 16654561 = 3422^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 28364645 - 2⁴ = 28364629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28364599 and 28364608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28364647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836460 + ... + 2836469.

It is an arithmetic number, because the mean of its divisors is an integer number (8509395).

Almost surely, 2^28364645 is an apocalyptic number.

It is an amenable number.

28364645 is a deficient number, since it is larger than the sum of its proper divisors (5672935).

28364645 is an equidigital number, since it uses as much as digits as its factorization.

28364645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672934.

The product of its digits is 138240, while the sum is 38.

The square root of 28364645 is about 5325.8468810134. The cubic root of 28364645 is about 304.9714028549.

The spelling of 28364645 in words is "twenty-eight million, three hundred sixty-four thousand, six hundred forty-five".